Jin is a Hunter and a descendant of one of the Eight Warriors who aided the hero who founded the New Yogo Empire after he defeated a water demon. His real name is Taiga Amusuran[1]; "Jin" is an alias meaning "two", and he acts as second-in-command in the anime. He wields blow-darts and shuriken as his unique weapons.

In the anime, Jin numbers among the initial pursuers sent to retrieve prince Chagum after Balsa leaves with him and manages to secure the prince. Jin attempts to kill him so that Chagum need not die by his own father's hands, knowing though that this act of insubordination would mean Jin's own death. However, he deems it a favour in return for the kindness that the prince showed him earlier in his life. As a result, he is particularly sympathetic to the prince and tends to be hot-headed in matters concerning the prince's life.

When he maintains a cool head, Jin is an effective warrior and keen analyst, much like the other Hunters. In the book, Mon refers to him as the smartest of the Hunters.

In the gaiden comic published by Square Enix, which serves as a tie-in prequel to the anime series, much of his backstory is given. He is the second son of three, but his younger brother, Toji, died of a sudden illness when Jin was about thirteen. His father then began training him as a Hunter, as Jin was now the youngest son. However, since the Hunters are trained from childhood, his father was concerned about the lack of time left to complete the training before his own retirement. Jin was also betrothed to a friend and neighbor, Mayuna. Mayuna became caught up in court intrigue relating to the betrothal of Prince Chagum (then five years old); despite the efforts of the Hunters, she was assassinated and died in Jin's arms. He confronted and killed the mastermind of the assassination - the father of the Third Empress - with the help of Hyoku, his agemate. He is 19 or 20 at the time of the anime.